Problems with functions

[lijrobert]

I'm trying to get the code below to call out what you say but its not any help for me? Sorry if I do any thing wrong I am new to this form
#include <iostream>

//Calling the varibles
double favnum;
int hybridnum;
//the home made function
void myfun(int x)
{
    using namespace std;
    cout << "Whats your favorite number?"; 
    cin >> favnum;
    hybridnum = favnum;
    cout << "buckys favorite number is also "; cout << x;
}
//the main function
int main()
{
    myfun(hybridnum);
}

[Gaminic]

Use [ code][ /code] tags (without the spaces) to make your code easy on the eyes.

Anyway, you messed something up: you never assigned a value to 'x' before outputting it. You read in a variable to favnum and copy it to hybridnum, but 'x' never changes. Change hybridnum = favnum; to x = favnum;.

Another possible problem is your scope management: you're passing hybridnum to myfun(), but hybridnum is already known in myfun, because it is global. What happens is that 'x' in your function call becomes a copy of 'hybridnum' [which has no value at time of copying!], which means that myfun actually has two versions of 'hybridnum': hybridnum itself (globally) and x (temporary locally).

Also, something that might confuse you at first: if you pass a variable by value (like you did), a copy is used throughout the function call, but the argument variable itself is never changed. At the end of myfun(hybridnum), hybridnum still won't have a value.

[lijrobert]

#include <iostream>
//Calling the varibles
double favnum;
//the home made function
void myfun(int x)
{
    using namespace std;
    cout << "Whats your favorite number?"; 
    cin >> favnum;
    x = favnum;
    cout << "buckys favorite number is also "; cout << x;
}
//the main function
int main()
{
    return 0;
}

I did this but now it dosen't even say anything would this be the right way to fix it?

[Gaminic]

a) You're not calling your function. Of course nothing happens.
b) 'x' has no point outside myfun. Rather than making it a parameter, you should just declare it inside your function.
c) Why did you put using namespace std; inside your function?

[lijrobert]

I figured it out

[lijrobert]

Gaminic I used it because it calls errors if I don't I use mac so it might be diffrent